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【Abstract】Critical Period Hypothesis（CPH） was first introduced to second language acquisition by Lenneberg in 1967.Then it aroused many scholars’ attention. There are both affirmative and negative views.
【Key words】Critical Period Hypothesis； Second Language Acquisition； Affirmative views； problems
1. Researchers’ Studies on CPH in SLA
Johnson
【Key words】Critical Period Hypothesis； Second Language Acquisition； Affirmative views； problems
1. Researchers’ Studies on CPH in SLA
Johnson